Vehicle brake



March 12, 1929. ANDR WS 1,705,350

VEHICLE BRAKE Filed June 14, 1927 4 Sheets-Sheet 1 March 12, 1929. H. G. ANDREWS VEHICLE BRAKE 4 Shets-Sheet 2 Filed June 14, 1927 Inventor i cffar /fkwen/o'" vnmcms BRAKE Filed June 14, L927 4 Sheets-Sheet March 12, 1929. H. G. ANDREWS VEHI CLE BRAKE 4-Shee1is-Sheet Filed June 14, 1927 lugs 35, and to pullthe pistons upwardly as through branches 43 on the bearings 40 and springs 44': disposed thereabout "impinging spring 56.

against the branches 43and against stops 45 to holdv the yoke upwardly. Rollers'46 are 'journaled adjacent the ends of therocker 36 for engagement with the hooks otthe ring-like plate 7 When theyoke'i'38 and parts attached thereto are moved downwardly by means of a cam structure 50 having a eanr portion 51 engaging theroller 4:1 rotatable by a gear 52 engaging a rack portion 53' of a bar 54 slidably through bearings 55 rising from brackets 15 and 16 and normally held in a predetermined position by means of a.

Anarm 57 is attached tothe cam structure 50 for engaging the knob 24 When the bar 54 V is pushed to thelet't inF-igure 3*by means of s uitablemechanism such as is illustrated at 58 in Figure 1. Thus'it will be seenythat after theroller 41 is brought to the outside of the camway 51 ofthe cam structure 50 the arm 57 engages the knob 2a to tend to close the valve to resist the fiow of the fluid through the pipe portion 19 connecting the bottoms 3 I of the two cylinders 17 and 18. r 4

.5 oil or like fluid are always maintained full b 40 full motion.

When the rollers 46 have been brought into V full" engagement with the. humps as they "move round ,by rotation ofthe Wheel, and

Whenthe pistonshavereached their maximum stroke,.the valve isthen closed, causing a very efficient and positive braking action as will beapparent because of the tendency to form'vacuum behind the pistons as they move upwardly. The valve is not closed until the f pumping mechanism has It will beseen thatlthe pa-rts containing the reason oit the reservoir 26 Which Will take kcarefof any of-the oil which is sucked out-of ithe cylinders"duringj'the actual braking operation. In order tomaintain thetap'pets 34 .in engagement with the lugs cables 60 are connected. to the rods 30 and pass'about the is indicated'toadvantage in Figure 2.

I have descr bed the invention. in connection 'With one \vheel only since it ivill be a mere matter of engineering design to ac'com} -modate the device to all four or more heels of a'vchicle. -The present embodiment of the invention has been disclosed in detail merely Way of example since in actual practice it attains the teatures of advantage 1 enmnerated'as desirable in thestatement of v the invent on and the above description. It

Willfbeapp'arent that'changes in the details of constructiomiandlin the combination and arrangement of parts may be resorted to Without departingfrom the spirit and scope of the invention as hereinafter claimed or sacrrficing any of lts advantages,

. HaY 1gth1lS descr b d p 'v agwhat I'ol'aimasne i u been brought into 1'. In a brakingmechanism of the class described, a movable member, a stationary meme =ber, sald movable member havlng a hump, a

pumping mechanism on the stationary mem; ber,movable meansonthe stationary memberior engaging the hump to set up action'of the pumping mechanism, and means for adjusting themeans to an operative and inoperative position, said pumping mechanism comprising a pair of cylinders, pistons movable in'said cylinders and operatively con member for engaging the hump to setup a'ction of the pumping mechanism, andmeans for ad usting themeans .to an operative and inoperative position, said pumping ,mechaism compris ng a pair of cylinders, pistons movable in said cylinders and operatively connected'with the first mentioned means, a

, pipe connecting the'cylinders, a valve mechanism associated with said lame and operable.

by the second mentioned means, and a reservoir connected With said pipe. 7 V 3. In a braking mechanism of the class de scribed, a movable member, a stationary hump, apumping mechanism on the stationfmember, said movable member having ;a.

ary-membendnovable means on the station-1 -ary member for engaging the hump to set up action of the pumping mechanism, andmeans y "for adjusting the means to an operative and lnoperative poslti-on, said pumping mechanism comprising a pair of cylinders, pistons movable in said cylinders and operatively connected with-said pipe, and a pipe connectconnected with the.firstrfmentioned means, a pipe connecting the cyhnders, a valve mechanism assoc1ated.\v1th saidpipe and operable 11?) by. the second mentioned means, areservoir ing the upper intermediate portions of the f,

cylinders and the upper portion of the reser t. In a braking mechanism oftheclass described, a rotatable member, a stationary member, a pair of cylinders mounted on the stationary member, a pipeconnectmg the bottom or the cylmders, valve mechanism in d pipe,-a valve operating rod connected u 'ith the valve mechanism, means for normally holding the valve mechanism open, pistons in the-cylinders, a rocker, means movably mounted on the stationary'member for'pivotlZO ally supporting the rocker, said'rotatablev member having :a hump engageablewith the ends of therocker, means connecting theends of the rocker with the pistons, cam 1means operating the rocker supporting 7 means, and

- an arm on said oain means swingab'le to enable in said cylinders, a pipeeonne'eting the gage the valve rod.

cylinders, and a. valve: mechanism associated 5. vIn a bra mg meehanisni of the classdewith theipipe; and meansadjiistable to opera- 9 scribed, a statlonary member; a movable tlvely connectthe pistons wlth the movable member on the stationary member; a pump-f member;

111g mechanism on the stationary member In testimony whereof l-afliximy signature.

' coinprisingva pair of cylinders, pistons niov-, HECTOR GEORGE ANDREVS, 

